HBASE-9914 Port fix for HBASE-9836 'Intermittent TestRegionObserverScannerOpenHook#testRegionObserverCompactionTimeStacking failure' to 0.94 (Takeshi Miao)



git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1572166 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10598 Written data can not be read out because MemStore#timeRangeTracker might be updated concurrently (cuijianwei)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1572334 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10594 Revert due to test instability

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1572436 13f79535-47bb-0310-9956-ffa450edef68
HBASE-10575 ReplicationSource thread can't be terminated if it runs into the loop to contact peer's zk ensemble and fails continuously (Feng Honghua & LarsH)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1572441 13f79535-47bb-0310-9956-ffa450edef68